EP0081592B1 - Scheibenbremse aus kohlenstoffarmen martensitischem rostfreien stahl - Google Patents

Scheibenbremse aus kohlenstoffarmen martensitischem rostfreien stahl Download PDF

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Publication number
EP0081592B1
EP0081592B1 EP82901623A EP82901623A EP0081592B1 EP 0081592 B1 EP0081592 B1 EP 0081592B1 EP 82901623 A EP82901623 A EP 82901623A EP 82901623 A EP82901623 A EP 82901623A EP 0081592 B1 EP0081592 B1 EP 0081592B1
Authority
EP
European Patent Office
Prior art keywords
quenching
hardness
weight
steels
martensitic stainless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82901623A
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English (en)
French (fr)
Other versions
EP0081592A1 (de
EP0081592A4 (de
Inventor
Keiichi Yoshioka
Noboru Kinoshita
Yutaka Ono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=13793666&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0081592(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0081592A1 publication Critical patent/EP0081592A1/de
Publication of EP0081592A4 publication Critical patent/EP0081592A4/de
Application granted granted Critical
Publication of EP0081592B1 publication Critical patent/EP0081592B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/027—Compositions based on metals or inorganic oxides

Definitions

  • the present invention relates to materials for brake discs for motorcycles and motor cars and is concerned with providing such materials which are low carbon martensitic stainless steels and which are easy to produce and have high rust resistance as well as excellent toughness and abrasion resistance.
  • the amount of carbon is as high as 0.2-0.3% and the hardness of the martensite itself, caused during quenching, is as high as 50-60 (H R C).
  • H R C the hardness of the martensite itself, caused during quenching
  • the ste'6l should be a mixed structure wherein two phases of martensite and ferrite are mixed in a moderate ratio and the ratio varies depending upon the temperature of heat treatment for quenching (and particularly suddenly varies in the range of 800-900°C) and the hardness varies from about 5 to 45 (H R C).
  • the hardness is apt to be affected by slight variations in the components of the steel.
  • the tempering is usually effected within a range of 550-650°C in order to control the hardness to the range of 30-40 (H R C) so that a zone of low Cr concentration is formed around the carbide and nitride of Cr which are precipitated as a result of this heat treatment. This lowers the corrosion resistance.
  • An object of the present invention is to provide brake discs formed of a low carbon martensitic stainless steel whereby the difficulties of the prior art are solved in that the desired properties for the brake disc can be obtained merely by quenching from a broad range of temperatures without the need for a severe heat treatment. Thus production is facilitated.
  • Low carbon martensitic stainless steels are known per se.
  • GB-A-2 027 745 discloses a martensitic stainless steel having excellent weldability and workability and being suitable for structural use, the steel consisting of not more than 0.02% C, not more than 0.02% of N, from 1.0 to 3.5% of Mn, not more than 1.0% Cu; less than 0.1 % Ni, from 10 to 13.5% Cr and not more than 0.5% Si, the remainder being iron and incidental elements and impurities.
  • GB-A-883 712 discloses a martensitic steel for the fabrication of, for example, steam turbine parts by welding, which steel consists of from 9 to 14% by weight Cr, from 0 to 0.4% by weight Si, from .02 to .06% by weight C, from .01 to .04% N, not more than .08% by weight C+N, from 0 to 4% by weight Ni, and from 0 to 6% by weight Mn, the remainder being Fe.
  • a martensitic steel for the fabrication of, for example, steam turbine parts by welding which steel consists of from 9 to 14% by weight Cr, from 0 to 0.4% by weight Si, from .02 to .06% by weight C, from .01 to .04% N, not more than .08% by weight C+N, from 0 to 4% by weight Ni, and from 0 to 6% by weight Mn, the remainder being Fe.
  • a brake disc formed of a low carbon martensitic stainless steel having a composition consisting of 0.04 to 0.10% by weight C+N, not greater than 0.5% by weight of Si, from 1.0 to 2.5% by weight of Mn, not greater than 0.5% by weight of Ni, not greater than 0.5% by weight of Cu, and from 10.0 to 14.5% by weight of Cr, the remainder being Fe less than 0.05% AI and impurities.
  • a structure consisting substantially of austenite single phase is obtained over a broad range of heat treatment (from about 850-1,050°C) by increasing the Mn content to 1.0-2.5% even with a low content of C+N of 0.04-0.10% without increasing the carbon content to a high value.
  • the hardness and toughness needed for motorcar brake discs are easily obtained by transforming the structure into martensite merely by quenching from the above described temperature range.
  • the excellent corrosion resistance is provided by including 10.0-14.5% of Cr without causing deterioration due to tempering.
  • C and N are effective elements for improving the hardness and abrasion resistance and in the present invention, 1.0-2.5% of Mn is essential for the below described reason.
  • Mn content in this range the content of C+N for obtaining the hardness on quenching of 30-40 (H R C) is 0.04-0.10%, so that this C+N content is limited to the range of 0.04-0.10%. This value is smaller than the content of the prior steels used for brake discs so that the toughness on quenching is good and no quenching cracks are formed.
  • Si is an element for forming ferrite at high temperatures and the addition of Si of more than 0.5% deteriorates the quenching hardness and adversely affects the toughness.
  • the upper limit is 0.5% but the amount is preferred to be smaller.
  • Mn is an effective element for preventing the formation of 6-ferrite at high temperatures and is an essential component for attaining the object of the present invention.
  • the content is less than 1 %, if the content of C+N is low, 6-ferrite is formed even at a temperature range of 900-1,050°C and the quenching hardness of 30-40 (H R C) is not obtained.
  • H R C quenching hardness
  • the temperature range of the quenching heat treatment for providing the hardness of 30-40 (H R C) is very narrow and the temperature control becomes difficult, so that the lower limit is set at 1 % in view of the object of the present invention.
  • H R C temperature range of the quenching heat treatment for providing the hardness of 30-40
  • the lower limit is set at 1 % in view of the object of the present invention.
  • Mn exceeds 2.5%, the oxidation resistance at high temperatures is lowered, there is much scale formation during the steps for producing the steel sheet, the sheet surface is roughened upon pickling, and the dimension precision of the steel sheet is considerably deteriorated.
  • the upper limit is set at 2.5%.
  • Ni is effective for preventing the formation of ⁇ -ferrite at high temperatures in a similar way to Mn.
  • this object can be attained by the addition 1.0-2.5% of Mn so that it is not necessary to particularly add Ni.
  • Ni is inevitable that about 0.1-0.5% of Ni is admixed from scrap used in the steel making steps and the presence of such an amount does not disturb the above described balance and does not cause any particular hindrance.
  • the upper limit needs to be fixed and this is 0.5%.
  • Cu is effective for preventing the formation of 6-ferrite at high temperatures in a similar way to Ni.
  • Mn since Mn is added, it is not necessary to particularly add Cu but when the Cu content exceeds 0.5%, as a consequence of the addition of scrap in the steel making process, the hot workability at high temperatures is deteriorated and the yield in the process for producing the steel sheets is considerably reduced.
  • the upper limit is set at 0.5%.
  • Cr is essential in an amount of at least 10% for maintaining the corrosion resistance.
  • the upper limit for each of Mn, Ni and Cu is reached, 5-ferrite is formed even in a quenching temperature range of 850-1,050°C and a quenching hardness of 30-40 (H R C) cannot be obtained.
  • the upper limit is set at 14.5%.
  • P should be lowered as far as possible in view of the toughness and S is preferred to be low in view of the rust resistance.
  • O is harmful for toughness and rust resistance, so that it is preferable to effect deoxidation using AI.
  • the AI content in the steel should be less than 0.05%.
  • rare earth elements may be added in order to improve the corrosion resistance and toughness by controlling the shape of the sulfides.
  • the temperature range for obtaining the quenching hardness of 30-40 (H R C) is very narrow, while in the steels of the present invention, the temperature range is as broad a 850-1,050-C.
  • the steels of the present invention (which have a quenching hardness of 30-40 (H R C) have a far higher toughness than the comparative steels and the impact value over the broad range of quenching temperature of 850 ⁇ 1,050°C is more than 5 kgf ⁇ m/cm 2. Also the steels of the present invention have a satisfactory toughness and do not exhibit quenching cracks.
  • the steels of the present invention do not rust over the broad quenching temperature range of 800-1,050°C and have high corrosion resistance.
  • the moderate hardness and toughness and the excellent corrosion resistance necessary for brake discs can be obtained merely by quenching from a broader range of quenching temperature than in accordance with the prior art.
  • mass production on an industrial scale can be easily realised and production costs can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Braking Arrangements (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (1)

  1. Schweibenbremse aus kohlenstoffarmem martensitischen rostfreien Stahl, der die folgende Zusammensetzung hat: 0,04 bis 0,10 Gew.-% C und N, nicht mehr als 0,5 Gew.-% Si, von 1,0 bis 2,5 Gew.-% Mn, nicht mehr als 0,5 Gew.-% Ni, nicht mehr als 0,5 Gew.-% Cu sowie von 10,0 bis 14,5 Gew.-% Cr, wobei der Rest auf Fe, weniger als 0,05% AI und Verunreinigungen entfällt.
EP82901623A 1981-05-30 1982-05-28 Scheibenbremse aus kohlenstoffarmen martensitischem rostfreien stahl Expired EP0081592B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP83132/81 1981-05-30
JP56083132A JPS602380B2 (ja) 1981-05-30 1981-05-30 低炭素マルテンサイト系ステンレス鋼オ−トバイデイスクブレ−キ用材料

Publications (3)

Publication Number Publication Date
EP0081592A1 EP0081592A1 (de) 1983-06-22
EP0081592A4 EP0081592A4 (de) 1984-02-09
EP0081592B1 true EP0081592B1 (de) 1987-01-14

Family

ID=13793666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901623A Expired EP0081592B1 (de) 1981-05-30 1982-05-28 Scheibenbremse aus kohlenstoffarmen martensitischem rostfreien stahl

Country Status (5)

Country Link
US (1) US4452649A (de)
EP (1) EP0081592B1 (de)
JP (1) JPS602380B2 (de)
DE (1) DE3275104D1 (de)
WO (1) WO1982004268A1 (de)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60211051A (ja) * 1984-04-06 1985-10-23 Press Giken Kogyo Kk デイスクブレ−キのパツド摺接リング用素材
JPS60230961A (ja) * 1984-04-28 1985-11-16 Nippon Steel Corp デイスクブレ−キ用デイスク材料
DE3482772D1 (de) * 1984-10-11 1990-08-23 Kawasaki Steel Co Rostfreie martensitische staehle fuer nahtlose rohre.
DK7790D0 (da) * 1990-01-11 1990-01-11 Forenede Jernstoeberier A S De Bremseskiver til automobiler og fremgangsmaader til deres fremstilling
US5556078A (en) * 1992-12-16 1996-09-17 Elephant Chain Block Company Limited Manual hoist and traction machine
DE4445898A1 (de) * 1994-12-22 1996-06-27 Schaeffler Waelzlager Kg Reibpaarung für eine Synchronisiereinrichtung in Zahnräderwechselgetrieben
US5979614A (en) * 1996-09-25 1999-11-09 Nippon Steel Corporation Brake disc produced from martensitic stainless steel and process for producing same
US6464803B1 (en) 1999-11-30 2002-10-15 Nippon Steel Corporation Stainless steel for brake disc excellent in resistance to temper softening
KR20010097129A (ko) * 2000-04-20 2001-11-08 이구택 질소첨가 마르텐사이트계 스테인레스강
JP3491030B2 (ja) * 2000-10-18 2004-01-26 住友金属工業株式会社 ディスクブレ−キロ−タ−用ステンレス鋼
KR20050054058A (ko) * 2003-12-03 2005-06-10 주식회사 포스코 핀홀결함이 없는 마르텐사이트계 스테인레스강
US8852361B2 (en) 2005-03-17 2014-10-07 Jfe Steel Corporation Stainless steel sheet with excellent heat and corrosion resistances for brake disk
JP4646119B2 (ja) * 2005-06-03 2011-03-09 財団法人鉄道総合技術研究所 ブレーキディスクとその表面処理方法及びブレーキディスクの表面処理装置
CN101426941A (zh) 2006-04-21 2009-05-06 杰富意钢铁株式会社 抗回火软化性大的制动盘
ES2744858T3 (es) 2006-10-05 2020-02-26 Jfe Steel Corp Discos de freno con excelente resistencia a ablandamiento por revenido y tenacidad
WO2014123229A1 (ja) 2013-02-08 2014-08-14 新日鐵住金ステンレス株式会社 ステンレス鋼製ブレーキディスクとその製造方法
CN103266214B (zh) * 2013-06-14 2015-07-01 莱芜钢铁集团有限公司 高锰钢的在线水韧热处理方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2891859A (en) * 1957-04-26 1959-06-23 Carpenter Steel Co Alloy steel
GB883712A (en) * 1958-06-16 1961-12-06 Carpenter Steel Co An alloy steel
SE330616B (de) * 1967-06-08 1970-11-23 Uddeholms Ab
FR1544296A (fr) * 1967-11-08 1968-10-31 Eaton Yale & Towne Procédé de fabrication d'objets en alliages austénitiques et produits
US3559775A (en) * 1968-04-01 1971-02-02 Gen Motors Corp Hypereutectic gray iron brake member composition
US4166521A (en) * 1976-02-17 1979-09-04 Honda Giken Kogyo Kabushiki Kaisha Stainless steel brake disc structure
JPS5521566A (en) * 1978-08-04 1980-02-15 Kawasaki Steel Corp Martensite system stainless steel for structure with excellent weldability and workability
JPS5635754A (en) * 1979-08-29 1981-04-08 Daido Steel Co Ltd Low temperature turbine blade steel and its heat treatment

Also Published As

Publication number Publication date
WO1982004268A1 (en) 1982-12-09
JPS602380B2 (ja) 1985-01-21
JPS57198249A (en) 1982-12-04
EP0081592A1 (de) 1983-06-22
US4452649A (en) 1984-06-05
DE3275104D1 (en) 1987-02-19
EP0081592A4 (de) 1984-02-09

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